I looked at a site named vintagetractorengineer.com but I couldn't decipher the numbers based on what is on that site.
The 6C17B part looks like your tractor might be a 1966, that was built on March 17 during the day shift. The B051957 part looks like it was built in Basilton and the serial number is 051957, but I'm not sure of any of that.
You might want to look at that site and see if it makes better sense to you.
Tom in TN